VAXstation 3100 Maintenance Guide Addendum Models 38 & 48

This document, the "VAXstation 3100 Maintenance Guide Addendum Models 38 & 48," published in September 1989, is a supplemental guide for Digital Customer Service personnel and self-maintenance customers.

Its primary purpose is to provide detailed procedures for troubleshooting, adjusting, and repairing the VAXstation 3100 Models 38 and 48 systems down to the Field Replaceable Unit (FRU) level.

The guide covers:

• Testing Procedures: Instructions for running power-up tests, self-tests, and system exerciser diagnostics.
• Troubleshooting: Methods to isolate problems to specific FRUs, particularly for 8 Mbyte memory modules, RX23 diskette drives, and the RZ56 disk drive expansion box.
• Utilities: Information on diskette formatting and creating special diagnostic keys.
• FRU Removal and Replacement: Comprehensive steps for disassembling and replacing various components within the VAXstation 3100 Model 38 system (e.g., disk drives, tape drives, MSC module, memory, graphics coprocessor, power supply), with Model 48 procedures noted as similar.
• RZ56 Storage Expansion Box: Detailed information on its SCSI bus configuration, connection, troubleshooting, and FRU replacement.
• Recommended Spares List: A list of parts for maintenance.